The reagent used for the distinction of $1^{\circ}, 2^{\circ}$ and $2^{\circ}$ amines is

• A

  $\mathrm{CH}_3 \mathrm{COCl}$
• B

  $\mathrm{ZnCl}_2 \mid \mathrm{HCl}$
• Correct answer
  C

  
  
• D

  $\left[\mathrm{Ag}\left(\mathrm{NH}_3\right)_2\right]^{+}$

Hence, the correct answer is option: 'C'.